Path: csiph.com!aioe.org!.POSTED!not-for-mail
From: parmenides <xparmenides@yahoo.com>
Newsgroups: comp.lang.java.programmer
Subject: Is it necessary the source file should be at the same location with the class file?
Date: Sun, 24 Jul 2016 00:55:20 +0800
Organization: Aioe.org NNTP Server
Lines: 74
Message-ID: <nn07hl$8ti$1@gioia.aioe.org>
NNTP-Posting-Host: KKephej3o10WsolWfXEGyA.user.gioia.aioe.org
Mime-Version: 1.0
Content-Type: text/plain; charset=gbk; format=flowed
Content-Transfer-Encoding: 7bit
X-Complaints-To: abuse@aioe.org
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0
X-Notice: Filtered by postfilter v. 0.8.2
X-Mozilla-News-Host: news://nntp.aioe.org:119
Xref: csiph.com comp.lang.java.programmer:35110

Hi,

I try to understand the relationship of the souce file and the class 
file. I have the following file cascade:
work/Test.java
work/Circle.java
work/compute/shape/

The Test.java is written:

import compte.shape.*;
public class Test {
         public static void main(String[] args) {
                 Circle c = new Circle(3);
                 System.out.println(c.circleArea());
         }
}

The Circle.java is written:

package compute.shape;
public class Circle{
    double radius;
    public Circle(double radius){
      this.radius = radius;
    }
    public double circleArea() {
      return Math.PI*radius*radius;
    }
}

I compiled the Circle.java and copied the Circle.class to the 
compute/shape directory:

javac Circle.java
cp Circle.class compute/shape

Then, I compiled the Test.java:

javac Test.java

I got a message like this:

Test.java:5: error: cannot access Circle
                 Circle c = new Circle();

I modified the first line of Test.java as follows:

import compte.shape.*;
===>
import compte.shape.Circle;

I compiled the Test.java again:

javac Test.java

and it is all right.

Then, I moved the Circle.java to compute/shape directory

mv Circle.java compute/shape

and changed the Test.java back:

import compte.shape.Circle;
===>
import compte.shape.*;

At last, the compiling of the Test.java is correct.

It seems that the source file should be at the same location as the 
class file.Is this right? Why the compiling is wrong? Thanks.